Source: https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/app/telnet_service
Telnet
Telnet is an application protocol used on the Internet or local area network to provide a bidirectional interactive text-oriented communication facility using a virtual terminal connection.
Source: https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/app/telnet_service